Tanssiaiset

input/code.cpp: In function 'int main()':
input/code.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < parit.size(); i++) {
                    ^
input/code.cpp:28:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (i+1 < parit.size() - 1) {
           ^

#include <iostream>
#include <vector>
#include <utility>
#include <algorithm>
#include <unordered_set>

using namespace std;

int main() {
	
	int n;
	cin >> n;

	vector<pair<int,int>> parit;

	for (int i = 0; i < (n/2) + 1; i++) {
		int a;
		int b;
		cin >> a;
		cin >> b;

		parit.push_back(make_pair(a,b));
	}

	sort(parit.begin(), parit.end());

	for (int i = 0; i < parit.size(); i++) {
		if (i+1 < parit.size() - 1) {
			if (parit[i+1].first == parit[i].first) {
				// found

				cout << parit[i+1].first << " " << parit[i+1].second << endl;
				break;

			}
		}
	}

	//cout << a << " " << b << endl;
	return 0;
}

Test 1

Group: 1

Verdict: WRONG ANSWER

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: WRONG ANSWER

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: WRONG ANSWER

Test 6

Group: 2

Verdict: WRONG ANSWER

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER